i remember this issue with the bussards from when I got my kit eight years ago. As I recall some modellers said they were able to heat the bussard dome using a hair dryer getting it hot enough to soften the plastic and straighten the shaft. Another option would have been to carefully drill several small holes close together around the perimeter of the shaft, drilling from the front of the bussard spinner dome. before using a sharp exacto knife to slice thru the remaining plastic between the holes. Once the shaft was free you could glue it back in after repositioning it. The photoetch includes a round brass piece to fit the recess in the center of the hub on the front of the spinner which would effectively cover up the repair work.

You could try either one of these fixes and if it didn't work you're not out anything but your time and effort since you coild still purchase a replacement spinner dome from PL.